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To properly size any furnace or ac unit a heat loss calculation should be done(heat gain for ac). Since two houses of the same size, one insulated well and the other not should not have the same size HVAC equipment. Therein lies the problem of sizing by sq ft. Do a search for HVAC Calc for a better idea of what I mean. This can be done by the home owner but is better left to a pro. Either way you will wind up better off and with equipment that suits what you actually need. Thus eliminating paying more for oversized equipment and shortening it`s lifespan by unecessary cycling on & off and also getting the most efficiency for your fuel $`s.

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14y ago
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Q: How many btu's would it take to heat a 2400 square foot house?
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